Abstract
The article investigates structure formation during surfacing of high-carbon coatings. The presence of a functional relationship between the lifetime of the weld pool and the formed structures of the deposited metal has been established. To change the time of existence of the weld pool, it is proposed to use a change in the deposition rate, surfacing modes and other factors. For various modes of existence of the weld pool, the presence of structures where the amount of retained austenite varies within wide limits was revealed. The ability to provide the necessary physical, mechanical and tribological properties has been obtained.
Highlights
The wear resistance of materials depends on the conditions of friction and wear, the combination of materials in a friction pair and their structural state
Savulyak [4] and other researchers show the possibility of controlling the processes of friction and wear by changing the composition, morphology, structure of friction surfaces and the degree of their metastability
Considerable attention of modern tribomaterials knowledge is paid to the creation of wear-resistant surface layers formed by surfacing by various methods
Summary
The wear resistance of materials depends on the conditions of friction and wear, the combination of materials in a friction pair and their structural state. In the works [5 - 8], the possibility of using the metastable state of retained austenite for positive structural transformations into martensite and similar structures during friction and wear of surfaces, as well as for absorbing excess energy entering the alloy for relaxation of internal stresses. Among the available structures of iron-carbon alloys, steels with a high austenite content show high wear resistance under abrasive friction, despite its low initial hardness, much lower than the hardness of both martensite and cementite [7]. The purpose of the work is to study the processes of controlling the formation of favorable structures of high-carbon coatings for operation under abrasive friction conditions, obtained by surfacing steel materials using carbon fiber materials, by changing the cooling rate of the system and the lifetime of the weld pool. Analysis of the surface of the microstructure (Fig. 1) showed that under the conditions of existence of the weld pool in the liquid state for 5 seconds, ~ 80 % of martensite, ~ 20 % of austenite and a small amount of inclusions were formed uniformly in the surface layer
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